An intense state of hard X-ray emission of Cyg X-1 observed by INTEGRAL coincident with TeV measurementsJ. Malzac, P. Lubiński, A. A. Zdziarski, M. Cadolle Bel, M. Türler and P. LaurentA&A, 492 2 (2008) 527-534DOI: https://doi.org/10.1051/0004-6361:200810227
